Durock Question

I may be overthinking this, but have to ask. Couldn't find the answer on USG's website.

I'm installing a hearth in my log home for a wood stove. Behind the stove will be an air space, a layer of 1/2" Durock, then 2-inch thick manufactured stovne veneer. My question is about the Durock. It is Class A fire rated, but it isn't fire I'm concerned about. Durock has some sort of mesh material in it. I don't know what it's made of, but it cuts easily with a utility knife. Will this material melt from the constant heat where the the masonry thimble passes through the Durock, and somehow compromise the installation? Do I need to hold the rock away from the thimble some distance? Any advice would be appreciated. Thanks.

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Durock Question

Quote:

Originally Posted by md2lgyk

I may be overthinking this, but have to ask. Couldn't find the answer on USG's website.

I'm installing a hearth in my log home for a wood stove. Behind the stove will be an air space, a layer of 1/2" Durock, then 2-inch thick manufactured stovne veneer. My question is about the Durock. It is Class A fire rated, but it isn't fire I'm concerned about. Durock has some sort of mesh material in it. I don't know what it's made of, but it cuts easily with a utility knife. Will this material melt from the constant heat where the the masonry thimble passes through the Durock, and somehow compromise the installation? Do I need to hold the rock away from the thimble some distance? Any advice would be appreciated. Thanks.

I've actually never asked myself that question.

I'm guessing you're buying it from Home Depot or Lowes?

Ask an assistant they usually take courses covering these kinds of questions.

Durock Question

I put a piece of Durarock into my woodstove just to see how it held up. The stove ran a cycle that maxed out at 600deg. surface temp - maybe 1000deg interior. And the durarock was only slightly discolored in a few places.

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